Crews spent Thursday morning carefully putting up Portland's giant Christmas tree ahead of next week's citywide lighting.Keely Crane Services and Shaw Brothers Construction donated staff, crane and transportation services for the delivery of the nearly 45-foot tree to Monument Square. Jeff Tarling, the city arborist, said the city conducted an exhaustive search for the tree but in the end the tree was close by, on the property of Alan Betters in South Portland. The tree will be adorned with more than 3,000 LED lights donated by Efficiency Maine for the city's tree-lighting ceremony on the day after Thanksgiving.